Re: 1990 Johnson9.9 dying after 5 mins
Hi maxpower. Welcome to the board.<br /><br />The gas is probably bad. A tune up would be a great idea. Here's some things to check.<br /><br />Check engine compression. You should have at least 90psi on each cylinder.<br />Using a spark checker, check ignition.<br />Change out the spark plugs.<br />Change out the lower unit gear lube. Check the old lube for signs of water. The oil will be a milky color or the water will be readily apparent. If the oil comes out just black, yer way over do for new lube.<br />If the new gas gets the engine going, decarb engine with engine tuner. This is readily available in several different brand names.<br />If she runs, check engine temp. You should be able to put your finger on the flat place just behind the head for a few seconds before having to remove your finger.<br />Get a service manual from the local Johnny/Rude dealership. This will tell you how to do all the above and then some. With the age of your engine, a carb rebuild and water pump impeller change out would be a great idea. The manual will take you through it step by step.
